Hypodermic syringe



Aug. 6, 1929. J. MacGREGoR HYPODERMIC SYRINGE Filed Aug. 23, 1924 fr/@72W /Uz /Vcmggofr g s WMMV @M7 @g5 Patented Aug. 6, 1929.

UNITED STATES 1,723,362 PATENT OFFICE.

JOHN MAOGREGOR, 0F CHICAGO, ILLINOIS, ASSIGNOR TO COOK LABORATORIES, INC., 0F CHICAGO, ILLINOIS, A CORPORATION 0F DELAWARE.

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Application led August 23, 1924.. Serial No. 733,675.

The present invention relates to hypodermic syringes, and among other objects aims to provide im rovements contributing to convenience an aseptic ractice. l

For illustration, one orm of syringe containingan embodimentof the invention is shown in the annexed drawings,in which Fig. 1 is a side elevation of the syringe.

Fig. 2 is an enlarged longitudinal section of the principal parts of the Syringe. y

It is to be understood that the illustrative form shown in the drawings is simply a preferred embodiment of the invention; and that in the following explanation of that specific form, the described details of structure and organization are merely exemplary.

The syringe comprises a holder or carrier represented by the syringe'barrel 1 in which a package or cartride'containing the medicament may be place a hypodermic needle 2 having associated therewith .a cartridge piercing canula 3 for conducting the contents of the cartridge to the needle; and means represented by a plunger rod 4 of the instrument for reducing the interior volume of the cartridge to expel its contents through the needle.

The cartridge shown iitted in the syringe barrel in Fig. 2 comprises a glass tube 5 having a puncturable head 6 and a plunger head 7 designed to be pushed forward by the plunger rod for forcing out the luid. This exemplifies a puncturable cartridge constructed to permit contraction of its interior space for expulsion of contents.

The puncturable cartridge head 6 is provided, in this instance, with a cupshaped plug of rubber or the like having a flange 8 overlying the mouth of the glass tube. This plug, when compressed to iit tightly in the mouth of the tube, provides an etl'ectual sealing closure susceptible of piercing by the fine canula 3 without undue eifort or liability of breaking the canula. Amon other uses the fiange 8 coacts with the end o the tube to prevent accidental forcing of the plug into the tube by the piercing operation. During the ejecting operation, the end thrust of the glass tube is cushioned by the plug 6, which seats against a removable head 9 screwed into the syringe barrel as at 9 and closing the same.

In the syringe shown, the'barrel may be opened at either end for insertion or removal of the cartridge, whose length approximates the length of the interior of the barrel. As shown, head 10 is screw-threaded at 11 to the barrel at the end opposite from head 9. The

.plunger 4 slides through head 10 and has an inner preferably enlarged end 12 designed to push cartridge head 7 during the ejecting operation. On the outer end ot' the plunger 80 there is a handle 18, which in conjunction with finger grips 14 carried by the head 10, provides means whereby the practitioner may slide the plunfrer longitudinally to dispense the contents oi the cartridge.

After inserting the cartridge in the syringe barrel, it may be pierced by forcing it against the initially-positioned canula, which is secured, as by swaging, within a fine axial bore 15 in the barrel headl 9, and extends from 70 said head into thevbarrel a suiicient distance to puncture the lug 6, but a. less distance than the length ov the screw-threaded portion of the head 9. The provision of two opposite openings 16 in the barrel enables the practi- 75 tioner the more readily to force the cartridge against the canula, and also permits survey of the cartridge and its contents.

To pierce the cartridge when initially inserted, the canula-carrying head 9 is simply screwed upon the barrel; and to facilitate such screwing, the head 9 is provided with a knurled flange 17, also serving as a stop. This procedure is a particularly easy operation due to. the fact that the head 9 engages the threads 9a on the barrel prior to the puncturing or' the cartridge plug, so that the canula is initially centered with respect to .said plug, and so that the considerable mechanical advantage of the screw threads is availed of. Then, too, the head 9 is convenient to handle and easy to cleanse and sterilize. Thus the diiiiculty and annoyance of manipulating a fine canula are minimized.

ProJecting from the outer end of barrel head 9 is a screw-threaded boss 18 to which the body 19 of the hypodermic needle 2 is secured. A gasket 20, of soft metal, seals the joint between the hypodermic needle and its carrying member 9, so that under the pressure which obtains during the ejecting operation the medicament is dispensed through the canula and needle without leakage.

The described syringe is particularly well designed for the aseptic administration of hypodermic medicaments, and is especially convenient for the busy practitioner or for a physician working under unusual and difficult conditions.

Obviously the present invention is not restricted to the particular embodiment thereof herein shown and described, nor is it indisensable that all the features of the invention be used conjointly; they may be employed advantageously in various combinations and sub-combinations as defined in the claims.

Notice is given that the specific cartridge herein shown and described, and a syringe comprising such cartridge with an associated holder having a cartridge-piercing canula or needle and a plunger to operate the cartridge, are the subjects-matter' of and are claimed by me in my prior and now pending applications Serial Nos. 713,902 and 713,903, iiled May 17 1924. Therefore in this application no claim is made for the cartridge per se nor broadly for a syringe embodying such cartridge apart from the features or characteristics of the present invention as recited in the appended claims.

In view of a prior invention and pending application of Everett L. Hoskins led J anuary il, 1923, Serial No. 610,565, relating to a syringe of the general type to which my present invention relates,in which Hoskins syringe the cartridge-holding barrel has at its fore end a detachable head with a detachable needle holder, the head being axially bored and jhaving an inwardly-protruding needle secured in the bore of said head and adapted to pierce through a stopper in the fore end of the cartridge tube, I do not claim such construction broadly or apart from the features or characteristics of the present invention as recited in the appended claims.

What is claimed is:-

1. A hypodermic syringe comprising, in combination, a puncturable medicament cartridge; a carrier for the cartridge; a head closing and screwed to one end of said carrier and provided with a conduit for the medicament; a canula fast to the head in communication with said conduit and projecting therefrom to extend into the carrier, the head, the canula and the cartridge being of such length that the head engages with the screw threads of the carrier before the canula pierces the cartridge, so that piercing thereof is facilitated.

2. An instrument of the class described, for use with a cartridge having a pierceable stopper in its fore end, comprising a cartridge holder provided at its fore end with a detachable screw-plug screwed into the holder and having a shoulder to en ge the end of the holder, said screw-plug lav'ing a fine Vaxial bore, and a canula consisting of a hollow needle fixedl secure'in said bore and projecting axia ly a substantial distance into said holder to pierce through said stopper; the proportion of the parts being such 'that whenthe screwlug is attached, after insertion of the cartrldge, the screw-plug will enage with the screw threads of the holder beore the canula pierces the stopper thereby centering the canula and enabling-the piercing to be done by the screwing up of the screwplug; and means associated with said holder for operating the cartridge Ato ex el its fluid contents through the canula an communieating bore to the delivery point of the instrument. Y

3. In an instrument of the class described,

for use with a cartridge having a pierceable stopper in its fore end, a cartridge holder provided at its fore end with a detachable screwplug having an axial bore and a canula consisting of a hollow needle xably secured in said bore and extending axially into the holder a substantial distance to pierce through said stopper,the proportions of parts being such that when attachin the screw-plug after insertion of the cartridge, the screw-plug will engage with the screw threads vof the holder before the canula pierces the stopper, whereby the canula is properly centered and the pierciig may be done by screwing up the screwr us- 4:. In an instrument of the class described, for use with a cartridge having a pierceable stopper in its fore end, a cartridge holder having a screw-threaded head to fit within and close one end of the holder; said head having an axial bore and a canula consisting of a hollow needle fixedly secured in said bore and projecting axially from the head a substantial distance into the holder to pierce through the stopper, and said head having a knurled annular fiange serving as a stop to limit the extent to which said head may enter the holder and also facilitating screwing of said head; the proportions of the head and canula extension being such that the head will engage the holder before the canula pierces the stopper.

In testimony whereof, I have signed my name to this Specification.

JOHN MACGREGOR. 

